[[RTContainerNavigationController alloc] initWithRootViewController:vc2]

[IDOKN]

tabController.viewControllers = @[[[RTContainerNavigationController alloc] initWithRootViewController:vc1],
[[RTContainerNavigationController alloc] initWithRootViewController:vc2],
[[RTContainerNavigationController alloc] initWithRootViewController:vc3],
[[RTContainerNavigationController alloc] initWithRootViewController:vc4]];
self.window.rootViewController = [[RTRootNavigationController alloc] initWithRootViewControllerNoWrapping:tabController];

1. vc1,vc2,vc3, vc4 无法使用到UIViewController (RTRootNavigationController)中的rt_navigationBarClass
2. UIViewController中无法获得UITabBarController

[rickytan]

vc1 2 3 4 应该都可以获取 tab controller 吧？